Earlier this year, 4-year-old Leah Carroll, a California child who has a rare blood disease, lifted spirits worldwide when her rendition of the song “Overcomer” by Grammy winner Mandisa went viral.

But this week, it was Leah’s turn for a bit of uplifting when Mandisa came to UCSF Benioff Children’s Hospital Oakland to meet the petite songstress for the first time, sing and play.

“Y’all, I’m with somebody very special right now,” Mandisa said during a Facebook Live video she shared with fans Wednesday. “This is amazing. It’s bringing me so much joy.”

Leah was born with severe congenital neutropenia. In February 2014, she had her first bone marrow transplant, and in March 2016, she underwent her second transplant. Since then, she has been recovering in the hospital in Oakland, California because of complications.